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OK - These things are ALL over my tank. I mean ALL over it. They started off on this ONE rock and now there are TONS of small ones attatched to the glass on the back of the tank and all over my powerhead..
I will have to test the water again but I have been doing 10% water changes about once every 2 -3 weeks. Nitrates are usually around 10ppm. Amonia normally 0 and nitrites usually 0. PH has been a solid 8.3 EVEN tho I do use a hood light..
I agree they are Q tip sponges. You might want to cut back on the feedings in your tank. Also check the parameters of your PWC water and top off water.